The alternator should work.
Connections on thw new alternator are :
B+ -> Battery
D+ -> Dashboard CHarge Light
W -> Tacho feed
If you just have 2 wires in the existing plug.. take it off, or cut it off, depending on how you are feeling.
The big cable which should head off towards your starter motor goes to B+, the D+ goes to the other cable which ought to head towards the bulkhead.
Hope that helps.